I have a 16GB iPhone 6 Plus with iOS 9.0.1 on it. My phone currently reports ~150MB of free space and I've always had this feeling that it was incorrect. I don't have a lot of apps and I store my photos/music in the cloud. I have even reviewed the storage space and nothing is taking up over a gig. This morning I decided to plug my iPhone into my Macbook Pro and check out iTunes. Lo and behold - iTunes reports that my iPhone has 4.45GB of free space. Now that makes more sense to me. Is this a known bug? Is there any way I can get my iPhone to see the extra space that is free?